Why did the Muslim armies conquer Persia Syria Damascus Jerusalem and Egypt?

The Muslim armies conquered Persia, Syria, Damascus, Jerusalem, and Egypt in the 7th century primarily due to a combination of military strength, political instability in the regions, and the appeal of Islamic teachings. The rapid expansion was facilitated by the weakened state of the Byzantine and Sassanian empires, which were preoccupied with internal conflicts and had exhausted their resources. Additionally, the promise of social justice, economic opportunities, and religious freedom under Islamic rule attracted many local populations to accept or support the conquerors. This expansion was part of a broader campaign to spread Islam and unify the Arabian Peninsula and beyond under a single political and religious authority.